linux-kernel - [PATCH 2/2] thermal: cpuidle: Register cpuidle cooling device

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Date:   Thu, 19 Dec 2019 23:19:28 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     daniel.lezcano@...aro.org
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-pm@...r.kernel.org (open list:CPU IDLE TIME MANAGEMENT FRAMEWORK),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/2] thermal: cpuidle: Register cpuidle cooling device

The cpuidle driver can be used as a cooling device by injecting idle
cycles. The DT binding for the idle state added an optional

When the property is set, register the cpuidle driver with the idle
state node pointer as a cooling device. The thermal framework will do
the association automatically with the thermal zone via the
cooling-device defined in the device tree cooling-maps section.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/cpuidle/dt_idle_states.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
index d06d21a9525d..34bd65197342 100644
--- a/drivers/cpuidle/dt_idle_states.c
+++ b/drivers/cpuidle/dt_idle_states.c
@@ -8,6 +8,7 @@
 
 #define pr_fmt(fmt) "DT idle-states: " fmt
 
+#include <linux/cpu_cooling.h>
 #include <linux/cpuidle.h>
 #include <linux/cpumask.h>
 #include <linux/errno.h>
@@ -205,6 +206,13 @@ int dt_init_idle_driver(struct cpuidle_driver *drv,
 			err = -EINVAL;
 			break;
 		}
+
+		if (of_find_property(state_node, "#cooling-cells", NULL)) {
+			err = cpuidle_of_cooling_register(state_node, drv);
+			if (err)
+				break;
+		}
+
 		of_node_put(state_node);
 	}
 
-- 
2.17.1